Energy Efficient in the VoIP broadcast is the main criterion and issue to be maintaining the small package and data as dispensation VoIP (QoS) over MANET environment. Mobile Adhoc network (MANETs) presents a good stage for the fast use of VoIP services in many request scenarios. The energy competence in handset mechanism for the data small package of say in the queue scheme has not been intense...

This study adopted a simulation based network performance analysis to investigate the effects of the application of different voice encoder schemes on QoS of VoIP system ,deployed with UMTS network Through different network simulation experiments using realistic network scenarios in OPNET environment, the results indicated that the choice of suitable voice encoder scheme with a small number of ...

Voice IP (VoIP) over wireless local area network (WLAN) is a topic of great interest in the research arena. To investigate what are the performance limitations in establishing VoIP calls over WLAN networks we performed some simulations. We show in this paper these simulation results in ad-hoc and infrastructure WLAN networks, working under ideal and real conditions. Measures and graphs of packe...

In this paper we develop a methodology to set the VoIP application parameters (voice packet size and dejittering delay) and the UMTS air interface parameters in such a way that the quality of VoIP calls involving a UMTS party is ensured. We use analytical techniques to determine the delay and packet loss contributions of the various transmission stages crossed by the voice packet flow, and the ...

Voice over the Internet protocol (VoIP) is being rapidly deployed, and the convergence of the voice and data worlds is introducing exciting opportunities. Lower cost and greater flexibility are the key factors luring enterprises to transition to VoIP. Some security problems may surface with the widespread deployment of VoIP. In this article, we discuss these security problems and propose a high...

Voice/Video over IP (VoIP) systems to date have been either highly centralized or dependent on the IP multicast in nature. Global Multimedia Collaboration System is a scalable, integrated and service-oriented VoIP conferencing system, based on the XGSP collaboration framework and NaradaBrokering messaging middleware. This system can provide media and session services to heterogeneous endpoints ...

Voice over Internet Protocol (VoIP) is one of the most important technologies in the world of communication. Around 20 years of research on VoIP, some Quality of Service (QoS) problems of VoIP are still remaining. The newly emerging wireless mesh network has fundamental difficulties in supporting VoIP applications due to the MAC overheads introduced by huge amounts of small packets. Packet aggr...

Over the last years Voice-over-IP (VoIP) is getting widespread adoption from business and residential customers.The preference towards VoIP services stems from the fact that VoIP provides many ways to communicate, with a lower cost than traditional telephony. However, VoIP in its present form may allow malicious users to exploit a number of vulnerabilities, make bulk unsolicited telephony calls...

The integration of Mobile IP standard and VoIP functions makes the Mobile Voice over IP (Mobile VoIP) service feasible. In Mobile VoIP applications, the mobile users can dynamically move around different networks, and thus result in handoffs. Handoffs will introduce packets loss, and thus significantly drop the quality of service (QoS). To support the QoS, we propose in this paper a two-buffer ...

Voice over IP (VOIP) the transmis­ sion of voice over traditional packetswitched IP networks is one of the hottest trends in telecommunications. As with any new technology, VOIP introduces both opportunities and security challenges. Lower cost and greater flexibility are among the prom­ ises of VOIP for the enterprise, but security administrators will face signif­ icant issues. Administrators m...